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      09-21-2011, 06:00 AM   #1
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Video: aftermarket exhaust?

Does this X3 have aftermarket exhaust or are they all this throaty? I test drove a couple of X3s but don't recall the exhaust note.

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      09-21-2011, 09:22 AM   #2
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i didnt hear anything. sounded like a stock car to me. and driving is different from listening from the outside,that may be the difference u are hearing.
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      09-21-2011, 09:35 AM   #3
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Quote:
Originally Posted by DavC5000 View Post
i didnt hear anything. sounded like a stock car to me. and driving is different from listening from the outside,that may be the difference u are hearing.
When I did my test drives I wasn't even paying attention for exhaust note. I noticed a nice, quiet interior. If that's the stock exhaust note I'll be pleased.

How about this vid? Stock?

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      09-21-2011, 09:45 AM   #4
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I thought the X3's sounded louder on the outside than most other cars.

The 35i was louder on idle than the 28i, but quieter under heavy throttle.
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      09-21-2011, 09:56 AM   #5
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The X3 definitely has a very throaty exhaust, especially during cold start and in a enclosed area.
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      09-21-2011, 10:19 AM   #6
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Pretty cool for stock!
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      09-21-2011, 10:44 AM   #7
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The X3(F25) comes with (3) distinctly different exhaust systems.

The "throaty", louder system is delivered on 35i models only. It uses a "Dual-Path" muffler that uses a quieter path through the muffler for light load cruising and a direct "straight-through" path during start up, at large throttle openings, and during turbo boosted operation. A electronically controlled vacuum actuator switches the muffler path.

The 35i can get away with an almost direct exhaust because of the inherent noise reduction of the turbocharger's turbine housing.

The 28i, 30d and 35d models use a dual pipe, single path (always muffled) system.

The 20i and 20d models use a single pipe, single path (always muffled) system.
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      09-21-2011, 10:48 AM   #8
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Quote:
Originally Posted by Lotus7 View Post
The X3(F25) comes with (3) distinctly different exhaust systems.

The "throaty", louder system is delivered on 35i models only. It uses a "Dual-Path" muffler that uses a quieter path through the muffler for light load cruising and a direct "straight-through" path during start up, at large throttle openings, and during turbo boosted operation. A electronically controlled vacuum actuator switches the muffler path.

The 35i can get away with an almost direct exhaust because of the inherent noise reduction of the turbocharger's turbine housing.

The 28i, 30d and 35d models use a dual pipe, single path (always muffled) system.

The 20i and 20d models use a single pipe, single path (always muffled) system.
Whoa, that is cool! Thanks!
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      09-21-2011, 12:55 PM   #9
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That video sounds quiet compared to my 35i! They are loud
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      09-21-2011, 01:07 PM   #10
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Quote:
Originally Posted by Toecutter View Post
When I did my test drives I wasn't even paying attention for exhaust note. I noticed a nice, quiet interior. If that's the stock exhaust note I'll be pleased.

How about this vid? Stock?
Toecutter, that exhaust video shows a diesel E83 X3, not a new 35i F25.
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      09-21-2011, 02:59 PM   #11
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      09-21-2011, 03:01 PM   #12
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Stock exhaust x35i

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      09-21-2011, 03:02 PM   #13
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There is a little engine revving going on at 0:25

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      09-21-2011, 07:28 PM   #14
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Quote:
Originally Posted by Lotus7 View Post
The X3(F25) comes with (3) distinctly different exhaust systems.

The "throaty", louder system is delivered on 35i models only. It uses a "Dual-Path" muffler that uses a quieter path through the muffler for light load cruising and a direct "straight-through" path during start up, at large throttle openings, and during turbo boosted operation. A electronically controlled vacuum actuator switches the muffler path.

The 35i can get away with an almost direct exhaust because of the inherent noise reduction of the turbocharger's turbine housing.

The 28i, 30d and 35d models use a dual pipe, single path (always muffled) system.

The 20i and 20d models use a single pipe, single path (always muffled) system.
Thanks for the post Lotus. I've had my car since April and its great to still be learning new things about it.
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      09-21-2011, 10:11 PM   #15
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Quote:
Originally Posted by Beyu View Post
Thanks for the post Lotus. I've had my car since April and its great to still be learning new things about it.
Electronically controlled, "dual-path" exhaust systems like the X3 35i uses are found on some other BMW's as well as several Ferrari models and the Chevy Corvette.
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